This is a nice collection of 19 open source games for Linux that contains most addictive, fun and refined games. For some of these games, also installation steps are included. tux-gamer Enjoy
AstroMenace is my favorite one, it is a modern 3D scrolling space shooter with ship upgrade possibilities. You can improve your ship configuration by installing new weapons, defensive systems, power stations and much more. To improve your ship, you must earn money by destroying throngs of enemies on every level.
AstroMenace is graphically unique. The quality of animation along with special effects is stunning, and with all its picturesque backgrounds adding brilliance to the visuals, the game is a true eye-candy.